On Thu, Jan 23, 2020 at 11:53:32AM +1100, Alexey Kardashevskiy wrote: > Anyone, ping? Sorry, I've totally lost track of this one. I think you'll need to repost. > > > On 10/01/2020 15:18, Alexey Kardashevskiy wrote: > > > > > > On 02/12/2019 12:59, Alexey Kardashevskiy wrote: > >> Here is an attempt to support bigger DMA space for devices > >> supporting DMA masks less than 59 bits (GPUs come into mind > >> first). POWER9 PHBs have an option to map 2 windows at 0 > >> and select a windows based on DMA address being below or above > >> 4GB. > >> > >> This adds the "iommu=iommu_bypass" kernel parameter and > >> supports VFIO+pseries machine - current this requires telling > >> upstream+unmodified QEMU about this via > >> -global spapr-pci-host-bridge.dma64_win_addr=0x100000000 > >> or per-phb property. 4/4 advertises the new option but > >> there is no automation around it in QEMU (should it be?). > >> > >> For now it is either 1<<59 or 4GB mode; dynamic switching is > >> not supported (could be via sysfs). > >> > >> This is based on sha1 > >> a6ed68d6468b Linus Torvalds "Merge tag 'drm-next-2019-11-27' of git://anongit.freedesktop.org/drm/drm". > >> > >> Please comment. Thanks. > > > > > > David, Alistair, ping? Thanks, > > > > > > > >> > >> > >> > >> Alexey Kardashevskiy (4): > >> powerpc/powernv/ioda: Rework for huge DMA window at 4GB > >> powerpc/powernv/ioda: Allow smaller TCE table levels > >> powerpc/powernv/phb4: Add 4GB IOMMU bypass mode > >> vfio/spapr_tce: Advertise and allow a huge DMA windows at 4GB > >> > >> arch/powerpc/include/asm/iommu.h | 1 + > >> arch/powerpc/include/asm/opal-api.h | 11 +- > >> arch/powerpc/include/asm/opal.h | 2 + > >> arch/powerpc/platforms/powernv/pci.h | 1 + > >> include/uapi/linux/vfio.h | 2 + > >> arch/powerpc/platforms/powernv/opal-call.c | 2 + > >> arch/powerpc/platforms/powernv/pci-ioda-tce.c | 4 +- > >> arch/powerpc/platforms/powernv/pci-ioda.c | 219 ++++++++++++++---- > >> drivers/vfio/vfio_iommu_spapr_tce.c | 10 +- > >> 9 files changed, 202 insertions(+), 50 deletions(-) > >> > > > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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